651340448640 has 512 divisors, whose sum is σ = 2642030438400. Its totient is φ = 148558675968.

The previous prime is 651340448573. The next prime is 651340448677. The reversal of 651340448640 is 46844043156.

It is a super-3 number, since 3×651340448640³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58901992 + ... + 58913048.

It is an arithmetic number, because the mean of its divisors is an integer number (5160215700).

Almost surely, 2^651340448640 is an apocalyptic number.

651340448640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651340448640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1321015219200).

651340448640 is an abundant number, since it is smaller than the sum of its proper divisors (1990689989760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651340448640 is a wasteful number, since it uses less digits than its factorization.

651340448640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11579 (or 11561 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 45.

The spelling of 651340448640 in words is "six hundred fifty-one billion, three hundred forty million, four hundred forty-eight thousand, six hundred forty".